3. A 3.0 kg box on a frictionless surface is attached to a 6 kg mass hanging off the edge over a frictionless, massless pulley with a massless string. How long does it take for the box to travel 1.0 m?
3.0 KE
GOKR
How long would it take the box to travel 1.0 m in the last question if the surface was rough and you added friction?